Clyve wrote:
snip
I'm not sure I agree with all of this.
The way I see it, Light changed when he got the Death Note. At first, he shows genuine fear at the idea of having to hurt people close to him, such as his family, and in the second part of the manga he's even shaken up by his sister's kidnapping (and not just because it endangers him). In my opinion, he has some kind of split persona, when he is both willing to manipulate and kill people to get closer to his goals, and suffers of it at the same time. He doesn't sleep anymore, various events manage to push him over the edge of nervous breakdown. Even after the death of his father, while he says that it was stupid of him to hope to better the world with such naive ideals, he also says that he did everything he did in order to create a world where people like his father could live in peace without fear of "bad" persons (from bullies to criminals) ruining it.
I think he both does and doesn't care for the people that die because of his actions, minus the ones he deems unfit to live (criminals). He cares about them because he would have liked to give them a "perfect" world in which they could have lived in peace, and he doesn't care about them because they are necessary sacrifices to create that "perfect" world. He has delusions of grandeur because he wishes to be able to manage the way everyone lives and thinks, and to protect the "good" people from the "bad" people. He wants to be a God because anything else wouldn't be able to achieve that goal. He's full of himself because he wants to be perfect and selfless.
As for L, he sticks to ideals of justice that are pretty basic, as in: you shall not kill, etc., even though he does sacrifices people too (such as the fake L). He doesn't consider the chase after Kira as a game but as a war, and he is very rustled when he loses battles, not just because he's immature. He did become a detective to stop criminals after all. I think he feels responsible for these deaths but rationalizes them by telling himself that he isn't the one that killed them. That being said, it seems like he doesn't consider lost human lives as more than "casualties" that don't really affect him. But even then, he's visibly upset at the deaths of his subordinates and colleagues, people he's personally involved with (as shown with Ukita's death or Watari's death). I think it's his antisocial tendencies that cause that.
Don't get me wrong, it's clear both of them use people for their goals, are responsible for the deaths of many, and that Light doesn't respect human life and is a mass murderer, but I don't think they're just sociopathic killers that are playing a game of cat or mouse either. There's more to them.